The developmental grades add to company’s battery separator film portfolio that incorporates the V-series separator films launched in 2007. Based on the same advanced co-extrusion technology platform and proprietary wet bi-orientation manufacturing process as V-series separator films, the developmental grades can help prevent the thermal runaway in batteries while offering LIB designers more flexibility in selecting electrode systems and formats in battery designs to enhance power and capacity density.

Higher Safety Margin with Advanced Performance Balance:

Each of the new developmental grades provides safety-margin enhancements. Developmental grade one extends thermal stability with an enhancement in transverse direction shrinkage to 8%, at 130ºC for 30 minutes, from 35.5% in previous-generation separator films.

Developmental grade 2 has a significantly improved shutdown temperature of 128°C, compared to 134°C for a standard V series grade, and maintains a longer insulation period with higher meltdown functionality.

“These developmental grades demonstrate our technology leadership advancement and commitment to the LIB industry in developing safer and better-performing batteries,” stated Jim Harris, senior vice president of ExxonMobil Chemical. “The enhanced performance characteristics of these new separator films will enable battery companies to develop smaller and more powerful batteries, including those required for next-generation, lower-emission vehicles.”

ExxonMobil Chemical presently manufactures battery separator films in the Nasu, Japan, and is building a manufacturing facility in Gumi, Korea, to accommodate extra demand and serve global customers reliably and efficiently. The new manufacturing plant will be finished in 2010.